Not my first flight ex LHR, but one of my first in..and it coincided with my first sight of a 747 ..PanAm..with #4 exciting people ..at the end of the runway..flames shooting..fire engines etc..and knowing we were lining up to get this newfangled piece of equipment.
Interesting...and WHAT an aeroplane it turned out to be! ( this was prob early 70s or late 60s?)